HP Company in 1968 on the production of red light-emitting LED light (wavelength 660nm), and then start to appear and can be used for the display of yellow, and green (wavelength 570nm), blue (wavelength 470nm) and pure green (wavelength 525nm), but due to high The brightness of pure blue and green semiconductor chip manufacturing technology in the hands of Japan and the United States in the hands of a small number of companies, resulting in more expensive price. LED displays used in the following light-emitting materials in the form of:
① LED light-emitting light (or a single lamp)

General from a single LED chips, a bowl of reflective metal anode, cathode metal composition, outsourcing has a condenser capacity of transmission of epoxy resin shell. Can be used one or more of the (different colors) constitute a basic single-pixel light, as the high-brightness, multi-screen outdoor use.

② LED dot matrix module

By the number of light-emitting chips constitute a matrix of epoxy resin used on packaging Su Liaoke inside. Suitable for scanning the ranks of drivers, easy to pose a high density of the screen are used for indoor display.

③ patch-light-emitting LED lights (or SMD LED)

LED is light-emitting light of the solder paste forms of packaging, can be used for indoor full-color screen, can be a single point of maintenance, and effective to overcome the phenomenon of mosaic.


Reference link: http://www.17led.com/LEDdisplay/2008-03/31.html